Changing drivetrain questions
 

I'm getting ready to change the drivetrain in my 72 long bed to a Blueprint 383 and Monster transmission with an Eaton posi. Does anyone else run this setup? I am going from the stock 350 and turbo 350. It has the 3.08 gear ratio in the back now but I have read it will be a bit sluggish cruising around. What gear ratio is everyone running or experiences have you had? I read a lot that says 3.42 or 3.73 would be a better fit...any help would be great!

Re: Changing drivetrain questions
 

Your truck only weighs about 200 lbs. more than my Z28. The Camaro has the stock LT1, 4l60E, and a 2.72 posi rear. It will smoke the tires from a standing start.

I don't think you're going to feel sluggish with that 383. I'd drive it before you put money into the rear.

Re: Changing drivetrain questions
 

Thanks for the input...I am thinking about trying it out before buying new gears to see what it's like.. I think a lot of it's personal preference for sure

Re: Changing drivetrain questions
 

383 cubes should have no problem moving the truck out nicely with 3.08 gears..
unless you put on 30" or taller tires

Re: Changing drivetrain questions
 

I have a similar setup (in my signature), with a blueprint crate, I changed my rear gears from the 3.08 to the 3.73 if you plan on doing a lot of highway driving i would keep the 3.08 and look a little higher stall converter for a quicker off the line , I noticed a big difference in highway driving before and after the rear end swap but it also has more low end get up and go

Re: Changing drivetrain questions
 

Thank you for the input..I will probably do a combination of both highway and around town. Wonder if I do change if the 3.42 would be a good choice.

My Blueprint engine will be here next week..how do you like yours??

Re: Changing drivetrain questions
 

Thanks for the feedback..I am running a 28.5" tall tire

Re: Changing drivetrain questions
 

i was always told when i was younger was a 3.55 was a good gear ,but i not know if it is available for the GM 12 BOLT